A penis that is small and hard to see in the dark, just like a ninja.
"Son of the Lumberjack is a ninja, and wears dressy sweatpants."
A cock so powerful and overwhelming that you have no idea what to do with it. An elite warrior. It is very speedy and unable to be tamed, specialising in a vast array of martial arts. The ninja cock has multiple times the power of a normal cock, and those who possess a ninja cock have a high ranking within their society. Only the very worthy come into contact with the ninja cock as it is very special.
Renee's ninja cock was so powerful and strong that Jess became un-conscious when she witnessed it.
The ninja cock knocked me out cold.
A cock that is lean and strong, able to move from position to position with incredible sensual speed. The ninja cock is secretly wanted by all females and unlocks secret, unknown depths of pleasure when used properly.
When offered the ninja cock, Sara's eyes opened and her blouse somehow dropped three buttons...
A giant cock that hits a bitch so hard she can't feel or even comprehend it's awesomeness, and therefore cums 9,200 times after the ninja cock leaves.
Women become pregnant by the mere thought of it. It is impossible to ignore. Shit, the ninja cock is inescapable and every bitch feels it before she dies.